hubieran cumplimentado
Past perfect subjunctive ellos/ellas/ustedes conjugation of cumplimentar.

cumplimentar

Los terceros podrán valerse siempre de los actos e indicaciones cuyas formalidades de publicidad aun no se hubieran cumplimentado, a menos que la falta de publicidad les privase de efecto.
Third parties may, moreover, always rely on any documents and particulars in respect of which the disclosure formalities have not yet been completed, save where non-disclosure causes them not to have effect.
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